[blink] Support (semi-)transparent background colors in WebView/Frame.

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 270 matching lines @@
   float clampPageScaleFactorToLimits(float) const;
   void resetScaleStateImmediately();
 
   HitTestResult coreHitTestResultAt(const WebPoint&);
   void invalidateRect(const IntRect&);
 
   void setBaseBackgroundColor(WebColor);
   void setBaseBackgroundColorOverride(WebColor);
   void clearBaseBackgroundColorOverride();
   void setBackgroundColorOverride(WebColor);
+  void clearBackgroundColorOverride();
   void setZoomFactorOverride(float);
   void setCompositorDeviceScaleFactorOverride(float);
   void setDeviceEmulationTransform(const TransformationMatrix&);
   TransformationMatrix getDeviceEmulationTransformForTesting() const;
 
   Color baseBackgroundColor() const;
+  bool backgroundColorOverrideEnabled() const {
+    return m_backgroundColorOverrideEnabled;
+  }
   WebColor backgroundColorOverride() const { return m_backgroundColorOverride; }
 
   Frame* focusedCoreFrame() const;
 
   // Returns the currently focused Element or null if no element has focus.
   Element* focusedElement() const;
 
   static WebViewImpl* fromPage(Page*);
 
   WebViewClient* client() { return m_client; }
@@ skipping 180 matching lines @@
   CompositorWorkerProxyClient* createCompositorWorkerProxyClient();
   AnimationWorkletProxyClient* createAnimationWorkletProxyClient();
 
   IntSize mainFrameSize();
   WebDisplayMode displayMode() const { return m_displayMode; }
 
   PageScaleConstraintsSet& pageScaleConstraintsSet() const;
 
   FloatSize elasticOverscroll() const { return m_elasticOverscroll; }
 
-  bool isTransparent() const;
-  void setIsTransparent(bool value);
-
   double lastFrameTimeMonotonic() const { return m_lastFrameTimeMonotonic; }
 
   ChromeClientImpl& chromeClient() const { return *m_chromeClientImpl.get(); }
 
   // Returns the currently active WebInputMethodController which is the one
   // corresponding to the focused frame. It will return nullptr if there is no
   // focused frame, or if the there is one but it belongs to a different local
   // root.
   WebInputMethodControllerImpl* getActiveWebInputMethodController() const;
 
@@ skipping 160 matching lines @@
   RefPtr<WebPagePopupImpl> m_pagePopup;
 
   // This stores the last hidden page popup. If a GestureTap attempts to open
   // the popup that is closed by its previous GestureTapDown, the popup remains
   // closed.
   RefPtr<WebPagePopupImpl> m_lastHiddenPagePopup;
 
   Persistent<DevToolsEmulator> m_devToolsEmulator;
   std::unique_ptr<PageOverlay> m_pageColorOverlay;
 
-  // Whether the webview is rendering transparently.
-  bool m_isTransparent;
-
   // Whether the user can press tab to focus links.
   bool m_tabsToLinks;
 
   // If set, the (plugin) node which has mouse capture.
   Persistent<Node> m_mouseCaptureNode;
   RefPtr<UserGestureToken> m_mouseCaptureGestureToken;
 
   WebLayerTreeView* m_layerTreeView;
   std::unique_ptr<CompositorAnimationHost> m_animationHost;
 
   WebLayer* m_rootLayer;
   GraphicsLayer* m_rootGraphicsLayer;
   GraphicsLayer* m_visualViewportContainerLayer;
   bool m_matchesHeuristicsForGpuRasterization;
   static const WebInputEvent* m_currentInputEvent;
 
   MediaKeysClientImpl m_mediaKeysClientImpl;
   std::unique_ptr<WebActiveGestureAnimation> m_gestureAnimation;
   WebPoint m_positionOnFlingStart;
   WebPoint m_globalPositionOnFlingStart;
   int m_flingModifier;
   WebGestureDevice m_flingSourceDevice;
   Vector<std::unique_ptr<LinkHighlightImpl>> m_linkHighlights;
   std::unique_ptr<CompositorAnimationTimeline> m_linkHighlightsTimeline;
   std::unique_ptr<FullscreenController> m_fullscreenController;
 
   WebColor m_baseBackgroundColor;
   bool m_baseBackgroundColorOverrideEnabled;
   WebColor m_baseBackgroundColorOverride;
+  bool m_backgroundColorOverrideEnabled;
   WebColor m_backgroundColorOverride;
   float m_zoomFactorOverride;
 
   bool m_userGestureObserved;
   bool m_shouldDispatchFirstVisuallyNonEmptyLayout;
   bool m_shouldDispatchFirstLayoutAfterFinishedParsing;
   bool m_shouldDispatchFirstLayoutAfterFinishedLoading;
   WebDisplayMode m_displayMode;
 
   FloatSize m_elasticOverscroll;
@@ skipping 20 matching lines @@
   Persistent<ResizeViewportAnchor> m_resizeViewportAnchor;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 }  // namespace blink
 
 #endif